[cam-users] source code changes

[David Noone]

Hi Cathryn,

Not sure what you mean by efficency, however, CAM has 2 sets of routines
that estimate the effects of convection. Both have tunable parameters
that modify certain aspects of the "efficiency". In zm_conv.F90 "tau"
defines the rate at which potentially unstable profiles are stabilized.
In moistconvection.F90 a similar parameter, "cmftau", is used. In both,
a parameter "c0" defines the rate of micophysical collection of cloud
droplets into larger precipitation drops that fall. Modifying these is a
good starting point, although you should note that these schemes make
substantial assumptions in their formulation on the character of
convective systems. In any case, I suggest you read the documentation -
especially sections 4.1 and 4.2:

http://www.ccsm.ucar.edu/models/atm-cam/docs/description/

Good luck,

David




On Thu, 23 Sep 2004, Cathryn Meyer wrote:

> I would like to change the convective precipitation efficiency in
> CAM3.0, however I am not sure where I need to go to do this.  Does
> anybody know what part(s) of the model source code deal with convective
> precipitation, and where they are located?
>
> Thanks,
> Cathy
>
>

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